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A751 addRELAY UHF Repeater Station - discontinued

A751 addRELAY UHF Repeater Station


Customer feedback has triggered the development of the A751 addRELAY. In difficult terrains or to bridge large distances the A751 is the solution to many transmission problems.

  • Remote Transmission Unit
  • IP-67; Ultra low power design; Cost effective solution to extend range of other short or lange range UHF radio loggers by 20km and more depending on installation; Same major components as other data loggers
  • Radio communication (430-470MHz), 500mW

If installed well, ideally in an elevated position such as an antenna tower, or on the roof of a storage silo, an A751 addRELAY can achieve distances going even beyond the 20km limit. With more than 10 RTU's to be routed through one A751 addRELAY we recommend the usage of a mains adapter or a dual-solar-panel setup.

Installation is rather easy. With all major components - CPU, radio and battery - packed into a single, compact aluminum case the A751 addRELAY only needs to be fixed to the mast. Connecting the solar panel will activate the RTU. No separate external enclosure is required.

A751 can be used as relay for the following UHF RTU's: A723 Series 3 and Series 4, A724 Series 3 and 4, A731, A732, A733, A740, A751, A752 and  A753 addWAVE.

Leaflet - A751 addrelay UHF
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Dimensions 160 x 60 x 80 mm (6.3 x 2.4 x 3.1 inch)
Weight 1150g (2.5 lb)
Protection Type IP-67
Power Supply internal 6.2V NiMH battery, charged by solar panel or mains adaptor
Connectors 1 x Binder M9 5-pin female for solar panel or mains adaptor
1 x TNC antenna connector
Mounting Mast mounting bracket
Antenna Rigid, omnidirectional, TNC, 2dB gain
Operating temperature -30°C ... +65°C (-22°F ... +145°F)
Data transmission:
Tx Output Power 500mW
Rx Sensitivity -120dBm (10 dB S/N)
Transmission Distance up to 20km (12 miles), depending on topography and installation
Operating Frequency 430 ... 470MHz (in 4 bands of 10MHz each)
Channel Spacing 10 / 12.5 / 25kHz (factory preset)
Approvals R&TTE, CE, FCC, Industry Canada, ACMA Australia
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